Yellowstone National Park
Yellowstone Geyser Timing
Which major geyser has the next useful prediction window, and how should that change the way you spend the next few hours? This page preserves the published window and source, then adds the planning context a raw prediction board cannot give you.
Next predicted window
Plan around the best current evidence.
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Source is shown exactly as provided.
Current prediction feed check
Current prediction board
Six major predictable geysers
Old Faithful, Castle, Daisy, Grand, Riverside and Great Fountain. A missing usable prediction means the page does not have a current window to show; it does not mean the geyser has stopped erupting.
Prediction literacy
How to use a geyser prediction window
The most useful way to read a Yellowstone geyser prediction is as a range of uncertainty, not a scheduled showtime. If a prediction says a geyser is expected around a particular time with a window around it, the practical target is to be in position before that window opens. Arriving at the center time can mean arriving after the eruption.
Stay close
If the window is about to open and the geyser matters to you, stop adding distant side trips. Use nearby boardwalks, restrooms or exhibits so you can return to the viewing area quickly.
Use the basin
A prediction several hours away is not wasted time. In the Upper Geyser Basin, use the gap to walk boardwalk loops and watch other thermal features rather than sitting in one place for hours.
Do not manufacture certainty
If a usable prediction is absent, treat that as missing decision evidence. Check the official NPS sources again later instead of assuming a typical interval will repeat exactly.
Yellowstone itself emphasizes that geysers change. Even Old Faithful, the best-known predictable geyser, is not an exact clock. Ranger predictions use observations and known behavior, and the park notes that prediction availability can change when the Old Faithful Visitor Education Center is closed.
Build your day so being early is useful. A boardwalk walk, visitor-center stop or nearby thermal feature makes waiting productive and removes the pressure to race back at the last second.
Match the event to the day
Choose the geyser that fits your day
The six predictable geysers are not interchangeable. They differ in location, eruption style, duration and the amount of waiting a visitor may need to tolerate. That makes the “next” geyser only one part of the decision.
| Geyser | What makes it useful to plan around | Best fit |
|---|---|---|
| Old Faithful | The easiest prediction to build a day around, with a large established viewing area next to the visitor center and lodges in the Upper Geyser Basin. | First-time visitors, limited time, groups that want the simplest predictable eruption. |
| Grand | A fountain geyser known for powerful bursts. NPS historical behavior data lists a much longer interval than Old Faithful, so the live window matters more than a casual “we'll catch it later” plan. | Visitors already spending substantial time walking the Upper Geyser Basin. |
| Daisy | A predictable Upper Geyser Basin option with a different setting and typically shorter event than the long displays of Riverside or Great Fountain. | People willing to walk beyond the Old Faithful viewing area and coordinate several predictions. |
| Castle | A cone geyser with a distinctive major eruption and steam phase. Minor eruptions can disrupt the normal prediction pattern, so current observations matter. | Visitors who want a different eruption style and can tolerate a wider planning window. |
| Riverside | An Upper Geyser Basin cone geyser that erupts at an angle across the Firehole River, producing a notably different visual experience from Old Faithful. | Walkers building a longer boardwalk day through the basin. |
| Great Fountain | The geographic outlier in this list. It is in the Lower Geyser Basin and can produce a long series of fountain bursts, so it is better treated as a separate destination decision. | Visitors whose route already includes the Lower Geyser Basin and whose current window justifies the drive and wait. |
Turn predictions into an itinerary
Build a geyser day without spending it waiting
The Upper Geyser Basin rewards a cluster strategy. Old Faithful, Castle, Daisy, Grand and Riverside are all part of the broader Old Faithful/Upper Geyser Basin experience. Great Fountain belongs to the Lower Geyser Basin. Treating all six as if they sit next to one another is how a prediction board becomes a frustrating driving schedule.
Anchor the day with the soonest strong window
Start with the geyser whose current prediction is both usable and compatible with your location. If Old Faithful is imminent and you are already in the Old Faithful area, it is usually a more practical anchor than chasing a later prediction elsewhere.
Look for prediction overlap before walking away
After the first eruption, compare the other Upper Geyser Basin windows. If Grand, Daisy, Castle or Riverside has a window that can be reached on foot without rushing, use that overlap to choose your direction through the basin.
Fill dead time with nearby thermal features
The goal is not to wait in one viewing area all day. Boardwalks around the Upper Geyser Basin contain many features that are not part of the six-geyser prediction board. A longer prediction gap is an invitation to explore, not proof that the prediction has failed.
Treat Great Fountain as its own branch
Great Fountain is in the Lower Geyser Basin, so a favorable live window may justify making it a destination. A poor or missing window is a reason not to bend an entire Old Faithful-area day around it.
This approach also reduces the temptation to speed or park badly because a prediction time is approaching. Yellowstone can be congested, parking can fill, and wildlife can stop traffic. A natural event is not worth turning the rest of the park visit into a race.
What the predictions represent
Why Yellowstone geyser predictions change
A geyser is an underground plumbing system driven by heat, water and pressure. The timing of an eruption depends on how that system recharges after previous activity. Some geysers show repeatable enough behavior to support a useful short-term prediction, while many others do not.
For Old Faithful, NPS explains that the duration of the previous eruption helps predict the next interval because a longer eruption discharges more water and heat and requires more time to recharge. Other predictable geysers use their own observed behavior. The result is a practical forecast, not a mechanical schedule.
That distinction explains why the page preserves the original window and source rather than collapsing everything into a false single-minute countdown. It also explains why expired predictions are removed. An old prediction is worse than no prediction because it looks precise while describing a natural system that has already moved on.
Yellowstone has more geysers than anywhere else on Earth, but only a small subset is predictable enough for regular visitor forecasts.
Old Faithful, Castle, Grand, Daisy, Riverside and Great Fountain are the primary visitor prediction set shown by NPS.
Use the published uncertainty as part of the itinerary instead of pretending a natural system has an exact appointment time.
Location matters
Upper Geyser Basin versus Lower Geyser Basin
Upper Geyser Basin
Old Faithful, Castle, Daisy, Grand and Riverside are part of the Upper Geyser Basin planning problem. That makes walking and sequencing more important than repeated driving. If several windows line up, one parking decision can support multiple eruption opportunities.
Old Faithful is the easiest orientation point because of its visitor infrastructure, but the basin has far more to offer than a single eruption. Use the boardwalk network and current predictions together.
Lower Geyser Basin
Great Fountain is in the Lower Geyser Basin and should be treated as a separate stop. NPS describes it as a fountain-type geyser with long eruptions made up of repeated bursts. Because its prediction window can be broad, the decision to pursue it should account for both drive time and how much waiting you are willing to accept.
If Great Fountain's current window does not fit your route, skipping it can be the better decision even if it is technically the next predicted event.
Safety and access
The prediction is never more important than the boardwalk
Yellowstone's hydrothermal ground can be thin and dangerously hot. NPS requires visitors to stay on boardwalks and designated trails in thermal areas. Do not leave a boardwalk for a better angle or shortcut because a prediction window is closing.
Old Faithful-area parking can also be limited during busy summer hours. Build parking and walking time into your arrival rather than treating the prediction center time as the moment to pull into the lot. In winter, access to the Old Faithful area changes substantially and is generally by oversnow travel rather than ordinary private vehicle.
For photography, NPS recommends arriving early for Old Faithful and being ready when the eruption starts because the peak height comes quickly. The same broader principle works for all predicted geysers: get settled before the window opens and let the eruption come to you.
Common planning questions
Yellowstone geyser timing FAQ
Does Old Faithful erupt every hour?
No. That is one of the park's persistent myths. Old Faithful is relatively predictable, but intervals vary. Use the current ranger prediction or current prediction feed instead of adding one hour to the last eruption.
Which geysers can I plan around?
Yellowstone currently publishes predictions for Old Faithful, Castle, Grand, Daisy, Riverside and Great Fountain when prediction information is available.
Why did a prediction disappear?
The prior prediction may have expired, new behavior may have made it unusable, or prediction operations may not be active. Missing data should be treated as uncertainty, not converted into a guessed eruption time.
Which geyser is best if I only have a short visit?
Old Faithful is usually the easiest to organize around because it is predictable, has major visitor infrastructure and offers a straightforward viewing area. The live board still matters because your actual visit may line up better with another event.
Can I see several predicted geysers without moving my car?
Potentially. Five of the six on this page are associated with the Upper Geyser Basin, so walking and prediction sequencing can create a much better day than repeated driving. Great Fountain is in the Lower Geyser Basin.
Are these predictions guaranteed?
No. Geysers are natural features. The prediction window is the best current estimate based on observations and known behavior, and it can shift.
Publisher methodology
How this page is built
The live engine checks current prediction records, removes expired records, preserves the published prediction window and source, and gives priority to official NPS-attributed records when more than one record competes for the same geyser. It does not calculate its own eruption model or turn historical averages into fake “live” predictions.
The publisher-written layer on this page answers the questions the feed cannot: whether the next event is worth rearranging your route for, which geysers belong to the same walking cluster, why Great Fountain is a separate geographic decision, how to use long prediction gaps productively, and how to distinguish a forecast window from an appointment.
The result is intentionally more than a republished table. The external data supplies current evidence; the page adds interpretation, trip structure, source boundaries and practical visitor decisions.
What this tool does and does not do
Yellowstone National Park directs visitors to current geyser predictions and emphasizes that natural features do not run on a schedule. This page republishes current prediction records from GeyserTimes, preserves the prediction window and source, and filters expired records. It does not calculate a proprietary eruption model.
Open Yellowstone current geyser activity
Contains information from GeyserTimes, made available under the Open Database License (ODbL).
Primary sources and further reading
- Yellowstone current geyser activity — official prediction context and the six-geyser visitor prediction set.
- NPS Old Faithful visitor guide — prediction availability, visitor area and Old Faithful context.
- NPS hydrothermal features — geyser mechanics, Yellowstone's thermal system and differences among geyser types.
- NPS Great Fountain Geyser — Lower Geyser Basin location and eruption characteristics.
- GeyserTimes — current community and NPS-attributed prediction records used by the live engine.
Reviewed against official Yellowstone NPS source material on September 16, 2026. Prediction records are time-sensitive and can change after publication.